Trolley base



FIG. 1 is a perspective view of a trolley base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view thereof, shown in a broken line environment of use;

FIG. 9 is a perspective view thereof, shown in an alternate broken line environment of use; and,

FIG. 10 is a perspective view thereof, shown in a second alternate broken line environment of use.

The broken lines depict portions of a trolley base in which the design is embodied that form no part of the claimed design. The broken lines depicting the environment of use for the trolley base in FIGS. 8-10 form no part of the claimed design. 

CLAIM The ornamental design for a trolley base, as shown and described. 